Detached-Eddy Simulation of Separated Wake Flow Around Complex Helicopter Fuselage Configuration
The contribution presents a detailed CFD study of a massively separated flow around a detailed EC135 helicopter fuselage in forward flight. Delayed detached-eddy simulation (DDES) is compared to conventional steady and unsteady RANS. The performance of all approaches is evaluated for two different geometrical configurations at three angles of attack. Excellent agreement of DES to different sets of experimental benchmark data is achieved particularly for the separated wake behind the cabin backdoor. An improvement of predictive accuracy is seen over URANS for both mean statistical quantities as well as unsteady solution content. Limitations to the comparability between CFD and experiment are furthermore discussed.
KeywordsPitching Moment Forward Flight Reynolds Number Effect Unsteady RANS Vortical Wake
The EC135 simulations were funded by the EU FP7 CleanSky project HELIDES (CSGA-2010-278415). Computing resources were provided by the North German Supercomputing Alliance (HLRN, www.hlrn.de). The geometries were provided by Airbus Helicopters Deutschland GmbH. The authors also wish to acknowledge fruitful discussions with M. Grawunder, TU Munich.
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